In the light of day I went to take a closer look at the other night’s planting. Even though it had been another super hot day I could still see the ground was still wet (from the other night?). It could hardly be from then! A super hot day…? The ground still showing it was wet? No chance!
I can only assume that one of my neighbours had been across and watered my beetroot before I arrived in the evening.
Possibly it was my neighbour… I suspect, because I dropped off several of my spare beetroot seedlings on to her plot before I left the other night.